More update woes

I am trying to package up an application at the moment that requires the install of a patch / update after the initial install.

1)I have created an mst for my main app using install tailor.

2)I have extracted an msi out of the setup.exe for the update and it appears to be the same msi as for the main application. Further more if I attempt to use install tailor to create an mst it takes me through the same wizard as for the main app.

If I install the main app and then run the setup.exe for the update I just get 1 dialog box asking if I want to install the update.

My question is why do I not just get the same dialog box asking if I want to install the update when I use install tailor ? What is the best approach for creating an mst for this so that I can be confident that I am only installing the update and not the whole app again ?

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G'Day,
Install your app on a clean machine and take a snapshot of the update (usually it's only a few files). Make sure you create your snapshot using uncompressed files and relative pathnames in the same folder as your project.
Then import those files into your original transform and increase the version of your transform to reflect the patched app.